1. SAR Tomography at the Limit: Building Height Reconstruction Using Only 3โ5 TanDEM-X Bistatic Interferograms.
- Author
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Shi, Yilei, Bamler, Richard, Wang, Yuanyuan, and Zhu, Xiao Xiang
- Subjects
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BUILDING repair , *SYNTHETIC aperture radar , *TOMOGRAPHY , *DIGITAL elevation models , *AIRBORNE-based remote sensing , *PHASE-shifting interferometry , *URBAN hospitals - Abstract
Multibaseline interferometric synthetic aperture radar (InSAR) techniques are effective approaches for retrieving the 3-D information of urban areas. In order to obtain a plausible reconstruction, it is necessary to use more than 20 interferograms. Hence, these methods are commonly not appropriate for large-scale 3-D urban mapping using TanDEM-X data, where only a few acquisitions are available in average for each city. This article proposes a new SAR tomographic processing framework to work with those extremely small stacks, which integrates the nonlocal filtering into SAR tomography inversion. The applicability of the algorithm is demonstrated using a TanDEM-X multibaseline stack with five bistatic interferograms over the whole city of Munich, Germany. A systematic comparison of our result with TanDEM-X raw digital elevation models (DEMs) and airborne LiDAR data shows that the relative height accuracy of two-third buildings is within 2 m, which outperforms the TanDEM-X raw DEM. The promising performance of the proposed algorithm paved the first step toward high-quality large-scale 3-D urban mapping. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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